To which group on the periodic table does radon belong?

What feature of cell theory is best demonstrated in the image

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons